@article{DAN_1982_262_5_a1,
     author = {S. K. Bloshanskaya},
     title = {On the existence of associated functions of a second-order operator},
     journal = {Doklady Akademii Nauk},
     pages = {1036--1039},
     publisher = {mathdoc},
     volume = {262},
     number = {5},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1982_262_5_a1/}
}